Even though initial reports that Russian hackers had penetrated the United States power grid by compromising a utility in Vermont were widely retracted Tuesday, U.S. Sen. Richard Blumenthal continued his call for Congress to establish a “select committee” to probe deeper into Russia’s actions.

“Vermont was really a blip,” said Blumenthal, referring to widespread criticism of a Washington Post story on Friday stating a Vermont utility’s laptop was found to contain malware U.S. officials initially thought could be linked to Russian hackers.

The Post story said The Burlington Electric Department, one of Vermont’s two largest electric utilities, confirmed it had found on one of its laptops the malware code used in Grizzly Steppe, the name the U.S. government has given to malicious cyber activity by Russian civilian and military intelligence services.

But on Tuesday, the utility company issued a statement, saying, in part: “On Thursday night, the Burlington Electric Department was alerted by the Department of Homeland Security (DHS) of a malware code used in Grizzle Steppe, the name DHS has applied to recent malicious cyber activity.

“We acted quickly to scan all computers in our system for malware signature. We detected suspicious Internet traffic in a single Burlington Electric Department computer not connected to our organization’s grid systems. We took immediate action to isolate the laptop and alerted federal officials of this finding.”